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Finding the Fourth Proportional to 1,071.63, 1,478.49 and 651.85

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Solution

The fourth proportional to 1,071.63, 1,478.49 and 651.85 is: 899.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,071.63 : 1,478.49 = 651.85 : x
  2. Step 2: Convert to fraction form
    1,071.63/1,478.49 = 651.85/x
  3. Step 3: Cross multiply
    1,071.63x = 1,478.49 × 651.85
  4. Step 4: Simplify right side
    1,071.63x = 963,747.57
  5. Step 5: Solve for x
    x = 963,747.57/1,071.63
  6. Step 6: Final answer
    x = 899.33

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.